A word most used as a greeting (instead of gentleman) for male audiences of djent music but can also be used for djent artists.

Might have come in usage through Misha Mansoor a.k.a. Bulb's side-project The Djentlemen.

Djent became largely popular on the internet draped with memes and inside jokes, thus creating a "cult" of listeners who would largely incorporate certain tendencies into their speech with one another. Though this isn't limited to djent listeners.